Cutterhead



Feb. 6, 1951 w, JQHNSbN 2,540,530

CUTTERHEAD 1 Filed Nov. 8, 1949 2 Sheets-Sheet l 1951 w. D. JOHNSON 2,540,

CUTTERHEAD Filed Nov. 8, 1949 2 Sheets-Sheet 2 ther f with a pos1 v aft:

i atented 6,

PATENT diJTTERHfiAfi I Wallace Dhfiohn s'on, Beloit, wis tas sinor -to fiate -American .:M hine,-fi0mp m Bel it; Wis.', a corporation of Delaware i 18 o h bs' 1 t t v f on 129 pmlefi e he h vi e p nem en fo div ee ter e19 bi tlpfovid d with qbv 'tttil tOIi gLQeS QW I eriein astemng meat is so constructed that it eida s the h'eagifto" receive bits; of wigth tions in W thd vet a flih iie s" of '11 of dovetail with respect to the blade {aid titheiobjett's off the niveritioitwin ofth'e invention? I v Fig. 2 is'a setio'n tak'efigenretlly on the lilies 2- 2 of Fig. 1';

Fig-Ts 1st section si ilar to that haw in eital fiesitie'n;

p i'iph at sur'f'tte' ct of the iriveritioii to pm.

itilttths. (01. Mi 2253 e" ti 5118. ction axially d h fl t f l0; The clamping bolt for a pair of bit clamping members 42. cess 4! extends axially across the head 46 and termediate its ends for engagement in the threaded aperture I8 in the fixed web member IT. The bolt 24 is provided on its outer end with a square shank 28 to receive a wrench for turning the bolt relative to the fixed web IT. Other means for turning the bolt relative to the web ll may be provided, such as a recessed hexagon in the head or screw driver slots at either end of the bolt.

The clamping members l and I6 are provided with oppositely disposed semi-circular recesses or grooves 29 which cooperate with the grooves I9 in recesses [4 for receiving the pins 30. The pins 30 extend the entire width of the body It of the cutter head, the recesses 14 and the fixed web portion I! being grooved or apertured as described to accommodate the pins 30.

Each of the faces l2 of the body I6 is provided with a series of transversely extending impact resisting corrugations 3| at one end thereof which also extends across the outer face of the fixed web portion H. The cutter bits I3 are provided with cooperating transversely extending corrugations 32 on the one end which engage with the corrugations 3| on the face 12.

The bits [3 are clamped to the head by the a clamping elements and I6 which are secured in axial alignment by the clamping bolt 24. In order to adjust the bits 13 individually of the head body II) in the axialdirectio-n of the latter it is merely necessary to rotate the bolt 24 by applying a wrench to a squared end 28. This provides micrometer adjustment of the cutter bits and permits positive location of the individual bits relative to the cutter head and to each other. This construction permits the use of any width of bit within the range of the head and accommodates any inaccuracy in the manufacture of the bits. The location and width of the dovetail with respect to the pattern need not be accurate due to the micrometer control of the axial adjustment of the individual bits. Each of the bits has adequate support on the body of the cutter head and impact resistance is provided by the inter-engaging serrations on the bits and the bit supporting faces on the head. The bits are securely clamped to resist centrifugal force and the impact of cutting in all operations of the cutter head.

The bit clamping members I 5 and [6 are cylindrical as illustrated, but they may be hexagonal or of some other shape with the recesses or pockets l4 formed to accommodate the particular shape of the same and with the pins 36 eliminated where the shape of the members is such that rotation in the pockets cannot occur.

A modified form of the invention is illustrated in Figs. 6 and '7 wherein the bit receiving faces of the cutter head 46 are each provided with an axially extending recess 4| which is circular in cross-section and which forms a track or way The reterminates at one end in a fixed web portion 43 which is shown integral with the body 40 but which may be secured thereto as a separate member. The web or member 43 is provided with a threaded aperture 44 which is aligned with the recess 4| and which is adapted to receive the threaded end of a clamping bolt 45. The bolt 45 extends axially in the recess 4| and carries the bit clamping elements 42 in Sliding relation thereon. One of the clamping elements 42 is adapted to be positioned against the head 46 o the bolt 45 and the other clamping element 42 is arranged in spaced relation for engagement with the downwardly inclined wedging surfaces 41 of the dovetail tongues on the cutter blade or bit indicated at 48. The clamping elements 42, which may be identical with the clamping element [5 previously described, are held in clamping relation with the bit 48 by a nut 49 positioned on the bolt 45 inwardly of the fixed web 43. The clamping elements 42 are provided with oppositely disposed semi-circular grooves 56, for cooperation with similar grooves Si in the walls of the head 40 which define the recess 4 I, for accommodating pins 52 to hold the clamping elements in onrotatable relation in the recess 4|, the pins 52 extending into aligned apertures in the web member 43 as shown. The clamping bolt 45 is provided with a squared head 53 or other means for accommodating a tool to rotate the same. With this construction clamping bolt 45 may be rotated to axially position the clamping element 42 which is remote from the web or anchor member 43 after which the bit 48 may be clamped between the elements 42 by rotation of the nut 49 on the bolt 45.

Another modified form of the invention is illustrated in Fig. 8 wherein the head 60 is provided with an axially extending recess 6i terminating at its one end in a fixed web 62 which is apertured at 63 to receive a clamping bolt 64 in slidable relation therein. The clamping bolt 64 is threaded at opposite ends and is secured in adjusted position in the aperture 63 by a pair of clamp nuts 65 arranged on opposite sides of the fixed web 62. Cooperating bit clam-ping elements 66 and 61 are mountedon the bolt 64. The clamping elements 66 and 61 are identical with the clamping element l5 previously described except that clamping element 61 is secured in fixed relation on the bolt 64 by a cross pin 68, while clamping element 66 is slidably positioned on the bolt 64 for engaging in clamping relation the bit indicated at 69. Clampin element 66 is shiftable on the bolt 64 toward and from clamping element 61 by means of a nut '16 on the end of the bolt 64 which is remote from the fixed web member 62. With this construction the clamping element 61 may be axially adjusted in the recess 6! by movement of bolt 64, after which the bolt 64 is secured to the web member 62 by the clamp nuts 65. The clamping element 66 is then shifted by the nut 10 to lock the bit 69 between the clamping elements 66 and 61.

A further modified form of the invention is illustrated in Fig. 9 wherein the bit receiving faces of the cutter head 10 are provided with pairs of aligned inwardly extending recesses II which are separated by intermediate web members l2. Clamping elements 13, which may be identical with the clamping element l5 previously described are mounted in the recesses H in slidable relation on a clamping bolt 14 which extends through a central aperture 15 in the web member 12 and which is secured therein by a pin 16. The bolt 14 is threaded at opposite ends and provided with a pair of clamp nuts 11 which are adapted to shift the clamping ele-- ments [3 toward and from each other and into engagement with the bit 18. With this construction either one of the clamping elements 13 may be axially adjusted in its recess H and thereafter the other clamping element shifted to clamp the cutter blade or bit in position.

While specific details of-construction of the device are shown in the illustrated form of the invention, it will be understood that modification of the same may be resorted to within the ridges thereon adapted to interengage with cooperating ridges on the bottom of said blade.

11. A cutter head having means for securing in cutting position thereon a bit, said securing means comprising an anchor member projecting radially of the head and having an aperture therein extending axially of the head, a pair of bit clamping members positioned at either side of said anchor member and adapted to be moved toward each other into clamping relation with the bit when the bit is positioned on the head, means for moving said clamping members toward each other, said last mentioned means being adjustably connected with said anchor member whereby said bit may be clamped to said head in axially adjusted position.

12. A cutter head and means for securing in clamped relation thereon a bit, said securing means comprising a radially extending web member on said head, said web member having an aperture extending axially of said head and said head having pockets extending axially on opposite sides of said web member, a pair of bit clamping members slidable in said pockets and a bolt member threadedly engaged in the aperture in said web member for moving said clamping members axially on said head and into the bit clamping position.

l3.-A cutter head and means for mounting thereon a cutter blade, said cutter head having an anchor member extending radially thereof and provided with an axially extending aperture, a threaded bolt adjustably mounted in the aperture in said anchor member and having a nut thereon, a pair of blade clamping elements on said bolt at opposite sides of said anchor member, said clamping elements adapted to be moved toward a blade positioned over said anchor member to clamp said blade in axially adjusted relation on said head, and guide means for maintaining said clamping elements in non-rotative relation relative to said bolt and nut during their movement.

14. In combination, a cutter head having a transverse groove therein, and a bit provided with a dovetail tongue on the bottom thereof extending at right angles to the groove, the cutter head having a fixed web member extending radially into the groove, a pair of bit clamps slidable in the groove, and means to connect the bit clamps in clamping relation with the tongue on the bit and in adjustable relation with the fixed web member.

15. In combination, a cutter head, a cutting blade and clamping means to fasten the blade to the head, said head having a supporting surface for said blade, said surface having a groove extending axially relative to said head, a fixed member extending across said groove, spaced clamping members shiftable in said groove and adapted to engage said blade in interlocking relation, and means engageable with said fixed member to shift said clamping members in said groove whereby to adjustably clamp said blade to said head.

16. A cutter head having a transverse groove, an anchor member projecting radially into a portion of said groove intermediate the ends thereof, said anchor member having an axially extending aperture, a bit overlying said groove and having a tongue on the bottom thereof at right angles to said groove, transversely spaced clamping members in interlocking relation in said groove and engageable with said tongue to draw the bit radially toward the head, said clamping members being individually shiftable in said groove toward and away from said anchor member and provided with axially extending apertures, and a clamping bolt extending through the apertures in said clamping members and said anchor member, said bolt being in fixed relation in the aperture in said anchor member and having nuts in threaded relation on the ends thereof for shifting and clamping said members relative to said bit whereby to axially adjust said bit relative to said head.

17. In a cutter head adapted to receive in clamping relation thereon a cutting blade, said head having a supporting surface for said blade, said surface having a groove extending axially relative to said head, a fixed web member extending radially of the head at one end of said groove, axially spaced shiftable blade clamping members in said groove adapted to engage the base of said blade in interlocking relation, and means including a threaded bolt adjustably connected to said fixed member to shift said clamping members toward each other in said groove whereby to adjustably clamp said blade to said head.

18. A cutter head for supporting a cutter blade, said head having a transverse groove, an anchor member projecting radially into a por-. tion of said groove at one end thereof, said anchor member having an axially extending threaded aperture, said cutter blade being adapted to overlie said groove and having a securing portion on the bottom thereof at right angles to said groove, transversely spaced clamping members in sliding relation in said groove and engageable with said securing portion to draw said blade radially toward the head, said clamping members being provided with axially extending apertures, and means including a threaded clamping bolt extending through the apertures in said clamping members and in threaded engagement in the aperture in said anchor member whereby to axially adjust said blade relative to said head.

19. A cutter head and means for mounting thereon a cutter blade, said cutter head having an anchor member extending radially thereof and provided with an axially extending aperture, a bolt adjustably mounted in the aperture in said anchor member, a pair of blade clamping elements on said bolt, one of said clamping elements being secured in fixed relation on said bolt, the other of said clamping elements being adapted to be moved relative to said fixed element to clamp a blade positioned over said groove in axially adjusted relation on said head, and means on said bolt for moving said clamping elements on said bolt.

20. A cutter head adapted to receive in clamping relation thereon a cutting blade, said head having a supporting surface for the blade, said surface having a groove extending axially relative to said head, a fixed member extending into said groove, spaced clamping members shiftable in said groove and having means for engaging the blade in interlocking relation, and means engaged with said fixed member to shift said clamping members in said groove whereby to adjustably clamp the blade to said head.

WALLACE D. JOHNSON.

No references cited. 

